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VESCENT D2-250外差模塊
特點：
動態平差底座-準直輕松、快捷！
通過重疊主從激光器兩光束得到光學拍音信號
光功率輸入范圍極大
直通式光束輸入
光學拍音信號通過光纖傳輸到探測模塊
多模光纖，準直簡單；單模光纖，信號大化
拍音監視出口為自由空間，便于準直
D2-250外差模塊經過重新設計用于實現主從激光器兩光束的重疊從而得到光學拍音信號。新式的動態平差底座使得主從激光器兩光束的準直更加輕松快捷。輸入接口的可旋轉玻片及偏振光束分束器的使用，使得當接收到是大范圍功率范圍時可以輕松獲取外差所需要的小部分功率。該模塊光學拍音信號經拍音探測器探測后轉換為電學拍音信號，并發送給D2-135偏移鎖相伺服器用于主從激光器之間的鎖定。
D2-135偏移鎖相伺服器將拍音信號同內部參考信號或者客戶提供的外部參考信號進行對比，將從激光器以預設的偏移量緊密鎖定到主激光器。D2-250易于準直，只需要兩個激光器分別提供總功率中的很小一部分即可正常運作。
VESCENT D2-250外差模塊
| D2-250 Heterodyne Module Specifications | |
|---|---|
| All specifications subject to change without notice. 1The maximum power incident upon the detector in the D2-160 Beat Note Detector from the sum total of the master and slave lasers must not exceed 1 mW. Damage to the detector can occur at average powers exceeding 1 mW. 2An FC/APC to SC/PC MM fiber is provided with the D2-160 Beat Note Detector. | |
| Parameter | Value |
| In-coupling | Free-space |
| Wavelength range | 700-1,000 nm |
| Power range | 0.1 mW to 200 mW in each laser |
| Pick-off percentage | 1-98% (variable) |
| Throughput | >98% in each laser; depending on waveplate orientation |
| Input polarization | Linear (horizontal or vertical) |
| Minimum power in beat note1 | >50 μW, optimally 200 μW |
| Max power at detector1 | <1 mw="" --1--=""> |
| Fiber connector on module | FC/APC2 |
| Compatible fiber type2 | Multimode or single mode |
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